39. (a) A particle contributes mr2to the rotational inertia. Here ris the distance from the originOto the particle. The total rotational inertia is () () ()222232321414(2.3 10 kg)(0.12 m)4.6 10 kg m .Imdmdmd−−=++==×=×⋅(b) The angular momentum of the middle particle is given by Lm= Imω, where Im= 4
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